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Osteochondroma

Case contributed by Leonardo Lustosa
Diagnosis certain

Presentation

Hard palpable mass on the left calf. Pain during knee movement.

Patient Data

Age: 12 years
Gender: Male
x-ray

Broad-based bony outgrowth with medullary and cortical continuity projecting away from the proximal tibia metaphysis. There's no periosteal reaction.

Classic appearance of a sessile osteochondroma.

Case Discussion

Osteochondromas are common benign bone tumors.

Their presentation is usually asymptomatic, but they can occasionally cause symptoms due to mechanical irritation of surrounding soft tissues.

Malignant degeneration, most commonly into chondrosarcomas, is a rare complication.

Treatment is surgical resection and is usually unnecessary unless the lesion is symptomatic or shows signs of malignant transformation.

In this case, the patient was symptomatic and the lesion was resected. Histopathology confirmed the diagnosis of osteochondroma.

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